<?xml version="1.0" encoding="UTF-8"?>
<!--
create table tab1(i int , j int , k varchar(10000));
create table tab2(i int , j int , k varchar(10000));
create table tab3(i int , j int , k varchar(10000));
insert into tab1 select 1, 2, repeat(‘a’,10000) from generate_series(1,1000) ;
insert into tab2 select 1, i, repeat(‘a’,10000) from generate_series(1,500) i;
insert into tab3 select 1, 2, repeat(‘a’,10000) from generate_series(1,5000);
analyze tab1;
analyze tab2;
analyze tab3;
set optimizer_penalize_broadcast_threshold=900;
explain select tab3.k, (select tab2.k from tab2 where tab2.i = tab1.i limit 1) as subq from tab3 left join tab1 on tab1.j = tab3.j order by tab3.k;
                                                        QUERY PLAN
 Result  (cost=0.00..170041752.00 rows=1664667 width=16)
   ->  Gather Motion 3:1  (slice4; segments: 3)  (cost=0.00..170041672.10 rows=1000 width=16)
         Merge Key: tab3.k
         ->  Result  (cost=0.00..170041672.04 rows=334 width=16)
               ->  Sort  (cost=0.00..170041672.04 rows=334 width=16)
                     Sort Key: tab3.k
                     ->  Hash Left Join  (cost=0.00..886.61 rows=1664667 width=4)
                           Hash Cond: tab3.j = tab1.j
                           ->  Redistribute Motion 3:3  (slice1; segments: 3)  (cost=0.00..431.08 rows=1665 width=4)
                                 Hash Key: tab3.j
                                 ->  Table Scan on tab3  (cost=0.00..431.03 rows=1665 width=4)
                           ->  Hash  (cost=431.06..431.06 rows=334 width=8)
                                 ->  Redistribute Motion 3:3  (slice2; segments: 3)  (cost=0.00..431.06 rows=334 width=8)
                                       Hash Key: tab1.j
                                       ->  Table Scan on tab1  (cost=0.00..431.02 rows=334 width=8)
               SubPlan 1
                 ->  Limit  (cost=0.00..164733.72 rows=1 width=1)
                       ->  Result  (cost=0.00..164733.72 rows=500 width=1)
                             Filter: tab2.i = $0
                             ->  Materialize  (cost=0.00..431.12 rows=500 width=4)
                                   ->  Broadcast Motion 3:3  (slice3; segments: 3)  (cost=0.00..431.12 rows=500 width=4)
                                         ->  Table Scan on tab2  (cost=0.00..431.01 rows=167 width=4)
 Settings:  optimizer_penalize_broadcast_threshold=900
-->
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